Improvement in millstone-drivers



F. J. BURT & J. S. WHITNEY.

MILLSTV'QNE DRIVER. No. 190,414. Patented May 8,1877.

UNITED FRANCIS J. BURT AND JOSHUA S. WHITNEY, OF ROCHESTER, MINNESOTA.

IMPROVEMENT IN MILLSTONE-DRI VERS,

Specification forming part of Letters Patent No. 190,414, dated May 8, 1877 application filed December 27, 1876. I

To all whom it may concern Be it known that we, FRANCIS J. BURT and JOSHUA S. WHITNEY, of Rochester, county of Ulmstead, and State of Minnesota, have invented Improvements in the Construction of Millstone-Drivers.-

The following description, taken in connection with the accompanying plate of drawings hereinafter referred to, forms a full and exact V specification,'wherein are set forth the nature which corresponding parts are designated by the same 1etters-Figure 1 represents the under side of arunner having our improvements applied thereto. Fig. 2 is a detached view of the driver.

In said drawings, A designates the revolving upper millstone, usually known as the runner. B is the balance-rynd or iron bar stretching across the eye of the runner, by

which it is poised on top of the spindle. G is the driving-block which sets on the square of the spindle, and the lugs of which bear against the said balance-rynd. Rubber cush- .ions or springs D are fitted in slots cut for their reception in said driving-block, between the said lugs and the balance-rynd, which enable the said runner to oscillate or swing in a manner highly advantageous. Various advantages are obtained by this construction, which will be readily understood by those skilled in the art to which the invention relateswithout further description.

Having thus described our invention, we claim and desire to secure by Letters Patent of the United States The combination of the balance-rynd B, the driving-block O, which sets on the square of the spindle, and the lugs of which bear against the balance-rynd, the rubber cushions D fitted in slots cut for their reception in the driving-block, and the runner A, as and for the purposes described.

In testimony that we claim the foregoing, we have hereunto set our hands this 13th day of December, 1876.

FRANCIS J BURT.

JOSHUA S. WHITNEY.

Witnesses:

CHAS. M. START, A. E. SAMUEL. 

